package com.greensock.easing {
	public class Sine {
		private static const _HALF_PI : Number = Math.PI * 0.5;

		public static function easeIn(t : Number, b : Number, c : Number, d : Number) : Number {
			return -c * Math.cos(t / d * _HALF_PI) + c + b;
		}

		public static function easeOut(t : Number, b : Number, c : Number, d : Number) : Number {
			return c * Math.sin(t / d * _HALF_PI) + b;
		}

		public static function easeInOut(t : Number, b : Number, c : Number, d : Number) : Number {
			return -c * 0.5 * (Math.cos(Math.PI * t / d) - 1) + b;
		}
	}
}